Intrinsic localized anharmonic modes at crystal edges.
Intrinsic localized anharmonic modes at crystal edges.
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晶体边缘的固有局域非谐波模式。
DOI：
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发表时间：
1995
影响因子：
8.6
通讯作者：
Schroeder
中科院分区：
文献类型：
--
作者：
Bonart;Mayer;Schroeder
使用双原子晶体的真实晶格动力学模型，发现了时间周期非谐振动，其位移模式集中在晶体边缘。定位不仅在法线方向上，而且在平行于晶格周期性边缘的方向上。这些振动模式是早期在线性链或高维晶格中研究的固有局域模式的三维模拟，每个晶格位点仅具有标量自由度。这些模式在比振动周期长得多的时间内的稳定性通过分子动力学进行了测试和验证。
Using a realistic lattice-dynamical model for a diatomic crystal, time-periodic anharmonic vibrations have been found with displacement pattern localized at an edge of the crystal. The localization is not only in the direction normal, but also in the directions parallel to the edge along which the lattice is periodic. These vibrational modes are three-dimensional analogs of the intrinsic localized modes studied earlier in linear chains or in higher-dimensional lattices with only a scalar degree of freedom per lattice site. The stability of these modes over times much longer than the vibrational period is tested and verified by molecular dynamics.